[Qemu-devel] [Bug 1312668] Re: x86 cpu nx feature: guest reboots after migrate exec

[Thomas Huth]

Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1312668

Title:
  x86 cpu nx feature: guest reboots  after migrate exec

Status in QEMU:
  Incomplete

Bug description:
  Using instruction on 
  http://www.linux-kvm.org/page/Migration
  I save VM state to external file and try load it, but VM starts, shows saved 
screen and reboots immediatly.

  Cmdline for vm state saving:

  $ sudo ./i386-softmmu/qemu-system-i386 -machine accel=kvm,kernel_irqchip=on 
-enable-kvm  -m 512 -hda image.raw -vga std -net none  -M pc -monitor stdio 
-cpu SandyBridge 
  (or  -cpu "n270" , or "kvm32,+sse2,+pae,+nx")

  Monitor cmd:
  (qemu) stop
  (qemu) migrate_set_speed 4095m
  (qemu) migrate "exec:gzip -c > STATEFILE.gz"  
  (qemu) q

  Cmdline for vm state loading:

  $ sudo ./i386-softmmu/qemu-system-i386 -machine accel=kvm,kernel_irqchip=on 
-enable-kvm  -m 512 -hda image.raw -vga std -net none  -M pc -monitor stdio 
-cpu SandyBridge -incoming "exec: gzip -c -d STATEFILE.gz"
  (or  -cpu "n270" , or "kvm32,+sse2,+pae,+nx")

  If I do the same without NX cpu feature (-cpu option "n270,-nx" /
  "SandyBridge,-nx" / "kvm32,+pae,+sse2") or on qemu-system-x86_64, VM
  save/load works correctly.

  Log kvm-all.c, DEBUG_KVM=y:

  QEMU 2.0.0 monitor - type 'help' for more information
  (qemu) kvm_init_vcpu
  ...handle_io.../...handle_mmio...
  kvm_cpu_exec()
  shutdown
  kvm_cpu_exec()
  interrupt exit requested
  io window exit
  kvm_cpu_exec()

  Host:

   $ lsb_release -rd
   Description: Ubuntu 12.04.4 LTS
   Release:     12.04

   $ uname -a
   Linux <username> 3.8.0-38-generic #56~precise1 SMP Tue Apr 22 12:46:44 MSK 
2014 x86_64 x86_64 x86_64 GNU/Linux

  Guest:
   1. Ubuntu 12.04 32bit 
   2. WIndows 8 32bit

  Qemu: v2.0.0
  commit a9e8aeb3755bccb7b51174adcf4a3fc427e0d147
  Author: Peter Maydell <address@hidden>
  Date:   Thu Apr 17 13:41:45 2014 +0100

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